Here's a small trick to deobfuscate code directly from vim, using B::Deparse. All you have to do is to put this in your vimrc:

    " Deparse obfuscated code
    nnoremap <silent> _d :.!perl -MO=Deparse 2>/dev/null<cr>
    vnoremap <silent> _d :!perl -MO=Deparse 2>/dev/null<cr>
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Now, whenever you want to deparse a portion of the code, just press _d. For example, this line:

    --$|&&s|\n|-|;
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Magically becomes:

    s/\n/-/ if --$|;
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I find this particularly useful when I have to work with code that abuses Perl's TIMTOWTDIness:

    $foo and $bar or $baz = 1;
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(Now imagine a three-lines long statement where the attribution comes at the end.) Using B::Deparse, the code becomes more legible:

    $baz = 1 unless $foo and $bar;
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Unfortunatelly, B::Deparse has it own limitations; but I think this technique can be really useful in some situations.